igt/gem_concurrent_blit: Limit number of reads for dmabufs

vgem provides WC mmap on its dmabufs, so reading and comparing these is
slow. We can employ a similar w/a to the other WC mmaps (i.e. mmap__gtt
or mmap__wc) and only check one pixel per page. This will speed up those
tests, but I don't know if it makes detecting coherency issues more or
less likely. :|

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

1 files changed, 8 insertions, 8 deletions

diff --git a/tests/gem_concurrent_all.c b/tests/gem_concurrent_all.c
index 3cf5998f..76aecd2a 100644
--- a/tests/gem_concurrent_all.c
+++ b/tests/gem_concurrent_all.c
@@ -387,12 +387,12 @@ static void
 dmabuf_set_bo(struct buffers *b, drm_intel_bo *bo, uint32_t val)
 {
 	struct dmabuf *dmabuf = bo->virtual;
-	uint32_t *v;
-	int size;
+	uint32_t *v = dmabuf->map;
+	int y;
 
 	prime_sync_start(dmabuf->fd, true);
-	for (v = dmabuf->map, size = b->npixels; size--; v++)
-		*v = val;
+	for (y = 0; y < b->height; y++)
+		v[pixel(y, b->width)] = val;
 	prime_sync_end(dmabuf->fd, true);
 }
 
@@ -400,12 +400,12 @@ static void
 dmabuf_cmp_bo(struct buffers *b, drm_intel_bo *bo, uint32_t val)
 {
 	struct dmabuf *dmabuf = bo->virtual;
-	uint32_t *v;
-	int size;
+	uint32_t *v = dmabuf->map;
+	int y;
 
 	prime_sync_start(dmabuf->fd, false);
-	for (v = dmabuf->map, size = b->npixels; size--; v++)
-		igt_assert_eq_u32(*v, val);
+	for (y = 0; y < b->height; y++)
+		igt_assert_eq_u32(v[pixel(y, b->width)], val);
 	prime_sync_end(dmabuf->fd, false);
 }